三级层序内受底流影响的富砂深水沉积演化规律——以东非鲁武马盆地中中新统为例

发布时间：2018-06-19 09:50

本文选题：鲁武马盆地 + 中新统　；参考：《天然气地球科学》2017年01期

【摘要】：鲁武马盆地深水沉积是深水重力流和底流综合作用的结果,局部水道和天然堤的迁移方向与底流运动方向相反,不同级别层序内的粗粒沉积物分布呈现出规律性。以高分辨率三维地震资料和测井资料为基础,在中中新统三级层序内识别出5种具有不同的岩性组成和规模的深水沉积结构单元,包括局限性水道复合体、朵体、决口扇、天然堤—溢岸沉积以及滑塌沉积。利用先进的地球物理成像技术和分析方法,建立了深水沉积复合体演化模式。研究表明,底流对重力流沉积的影响作用主要表现在天然堤的沉积位置和方式、水道的迁移方向、朵体的分布位置和展布等;不同级别的海平面变化旋回及不同的沉积位置,底流对重力流沉积产生不同的影响;有利储层主要分布在水道内及与底流运动方向相反的水道侧翼。
[Abstract]:Deepwater sediment in Luwu Ma basin is the result of the combined action of deep water gravity flow and bottom flow. The migration direction of local waterway and natural embankment is opposite to the direction of bottom current movement, and the distribution of coarse grain sediment in different order sequences is regular. On the basis of high resolution 3D seismic data and logging data, five types of deep-water sedimentary structural units with different lithological composition and scale were identified in the third order sequence of Miocene, including limited watercourse complex, dolomite and crevasse fan. Natural embankment-overflow deposit and sloughing deposit. Based on the advanced geophysical imaging techniques and analytical methods, the evolution model of deep-water sedimentary complex is established. The results show that the influence of bottom flow on gravity flow deposition is mainly manifested in the deposition position and mode of natural embankment, the migration direction of watercourse, the distribution and distribution of flower body, the different sea level change cycles and different sedimentary positions, and so on. The favorable reservoir is mainly distributed in the channel and the flank of the channel opposite to the movement direction of the bottom flow.
【作者单位】：中国石油杭州地质研究院;
【基金】：中国石油天然气集团公司科学研究与技术开发项目(编号:2016D-4303)资助
【分类号】：P618.13

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